Design Of Remote Measurement System In The Chlorophyll Content Of Rapes Based On Zigbee

Precision agriculture has become a focus of concern for developed countries being confronted with 21 st century, utilizing reasonably agricultural resource, improving quantity and quality of agricultural products, reducing producing cost,and improving environment and agricultural sustainable development. The essential of precision agriculture is precisely to manage complex agricultural system based on information and knowledge. Precision agriculture realizes work out measures to suit local conditions, suit crop and time comprehensive balanced fertilization, and has obvious economic and environmental benefits. How to acquire field information rapidly and precisely has become a difficult issue of precision agriculture. Chlorophyll is the important factors of the crop in its growth stage, and it is the favorable indicator of nutrition stress and photosynthesis. Site-specific crop nutrition diagnosis is the basics of the scientific fertilizer management, and it is essential for the practice of precision agriculture.Considering the presence problem of the heavy workload and high cost in crop nutrition component testing process, and the actual situation of our country, the remote measurement of rape chlorophyll content system design scheme were developed and studied in this thesis. A nondestructive measuring instrument for plant chlorophyll was developed, which can perform real-time, quick and nondestructive measurement of crop chlorophyll.Since no has special sensor in the detection of crop chlorophyll content, and the traditional chemical has the problems of restricted by the device, long time of sample preparation and analysis, and not convenient for nondestructive testing, this paper gets the rapes leaf spectral information using the near infrared spectra analysis techniques. From near infrared spectroscopy laboratory testing practices, this paper takes the Zigbee wireless communication technology implicating in wireless measuring crop nutrition composition, propounds the a design on transmuting of rape leaf spectral information by Zigbee wireless communication technology . Then the obtained spectral information were made filtering, and uses variables linear regression method was used to develop the quantitative analysis model for chlorophyll content with absorbance spectroscopy. Each leaf sample was spectrally scanned by OPT101 photo detector of BURR BROWN. Chlorophyll standard value of each rape leaf was measured by SPAD-502 meter, Minolta Camera, Japan. STC89C516RD+ Single chip microcomputer was selected as main controller; the wireless communication module processor selects CC2430 to complete data transmission.Finally, prediction samples were predicted by the model. The predicted value of the sample and reference values of correlation coefficients in prediction set sample is 0.89, and the root mean square error of prediction is about 1.2SPAD. It could be concluded that it is feasible to measure plant chlorophyll content based on Zigbee Remote Measurement System in the Chlorophyll Content of Rapes. It realizes rapid and nondestructive measurement of chlorophyll content, and it is also significant in precision fertilization in the future.